Ion Track Technology

PhysicsConsult

Reimar Spohr

PostHeaderIcon Abstract

Solvent-induced track sensitization. Swelling and diffusion measurements. M. Eßer, P. Apel, W. Brüchle, J. Fuhrmann, B. Heinrich, G. Remmert, R. Spohr, C. Trautmann, J. Vetter. Nuclear Inst. and Methods in Physics Research, B 91(1994)157-161.

Solvent induced sensitization of heavy ion tracks in 19 μm polyethylene terephthalate foils (Hostaphan RN19) is studied using dimethyl formamide (DMF) as swelling agent (thickness increase 5–7%) and argon gas as permeant. Due to the latent ion tracks acting as irrigation pipes the irradiated material swells one to two orders of magnitude faster than the original material. The effect of diffusion enhancement decreases with increasing linear energy transfer (LET) of the ions from about 8 for 15 MeV/u Ar to about 2–4 for 11.4 MeV/u Pb. The study of diffusive transfer of molecules along latent tracks enables an insight into sorption phenomena. It yields details concerning swelling, swelling equilibrium, and diffusion processes preceding track etching.